diff options
Diffstat (limited to 'coord.c')
| -rw-r--r-- | coord.c | 117 |
1 files changed, 117 insertions, 0 deletions
@@ -0,0 +1,117 @@ +/* $Id: coord.c,v 1.1.1.1 2010/07/17 17:30:32 culot Exp $ */ + +/* + * Copyright (c) 2010 Frederic Culot <frederic@culot.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * - Redistributions of source code must retain the above + * copyright notice, this list of conditions and the + * following disclaimer. + * + * - Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the + * following disclaimer in the documentation and/or other + * materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "oldrunner.h" + +void +coord_copy (const struct coord *orig, struct coord *dest) +{ + dest->y = orig->y; + dest->x = orig->x; +} + +void +coord_below (const struct coord *orig, struct coord *dest) +{ + dest->y = orig->y + 1; + dest->x = orig->x; +} + +void +coord_above (const struct coord *orig, struct coord *dest) +{ + dest->y = orig->y - 1; + dest->x = orig->x; +} + +enum move +coord_opposite_dir (enum move dir) +{ + switch (dir) + { + case MOV_RIGHT: + return MOV_LEFT; + case MOV_LEFT: + return MOV_RIGHT; + case MOV_UP: + return MOV_DOWN; + case MOV_DOWN: + return MOV_UP; + default: + return MOV_NONE; + } +} + +void +coord_compute (const struct coord *orig, enum move move, struct coord *dest) +{ + coord_copy (orig, dest); + switch (move) + { + case MOV_UP: + dest->y--; + break; + case MOV_DOWN: + case MOV_FALL: + dest->y++; + break; + case MOV_LEFT: + dest->x--; + break; + case MOV_RIGHT: + dest->x++; + break; + default: + dest->y = dest->x = 0; + /* NOTREACHED */ + } +} + +void +coord_set_yx (struct coord *coord, int y, int x) +{ + coord->y = y; + coord->x = x; +} + +unsigned +coord_equal (const struct coord *p1, const struct coord *p2) +{ + return p1->x == p2->x && p1->y == p2->y ? 1 : 0; +} + +void +coord_diff (const struct coord *p1, const struct coord *p2, struct coord *diff) +{ + diff->y = p1->y - p2->y; + diff->x = p1->x - p2->x; +} |